There is no immediate word of breakthrough after Tillerson's meetings with Saudi, UAE, Bahraini and Egyptian officials.

US Secretary of State Rex Tillerson has ended talks with ministers from Saudi Arabia and three Arab allies over how to end a month-long rift with Qatar, but there was no immediate word of a breakthrough.

Tillerson met the foreign ministers in Saudi Arabia's Red Sea city of Jeddah on Wednesday in pursuit of an end to the worst dispute in decades among the US-allied Gulf Arab states.

Tillerson also met separately with Saudi King Salman and Crown Prince Mohammed bin Salman to discuss cooperation in combating terrorism and its financing.

At that meeting, the Saudi crown prince praised the "continuous cooperation" between his country and the US.

During that meeting, Tillerson and the Qatari foreign minister announced that the US and Qatar made an agreement on combating "terrorism" and its financing.

But Saudi Arabia, Egypt, Bahrain and the United Arab Emirates (UAE) called the agreement "insufficient".

Any resolution of the impasse must address all the key issues demanded by Saudi Arabia and its allies, a senior UAE official told Reuters ahead of the Jeddah talks.

US officials had earlier said Tillerson does not expect an immediate breakthrough, which they warned could be months away.

Rather, they said, he wants to explore possibilities for more negotiations.

But in another sign of the dispute continuing to simmer, UAE Minister of State for Foreign Affairs Anwar Gargash sent a formal complaint to the UN High Commissioner for Human Rights on Wednesday alleging that the Qatar-based Al Jazeera network supported terrorism, sectarianism and anti-Semitism.

UAE Foreign Minister Sheikh Abdullah bin Zayed al-Nahyan also told reporters during a visit to Slovakia that Tillerson's visit was unlikely to resolve the row.

"I think it will ease tensions but it's just postponing the problem, which will grow in the future."

The four countries slapped sanctions on Qatar on June 5, accusing it of financing extremist groups and allying with the Gulf Arab states' arch-foe Iran -- allegations that Doha has repeatedly denied.